diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..d2d6c66
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,5 @@
+root = true
+
+[*.{js,ts}]
+indent_style = space
+indent_size = 2
\ No newline at end of file
diff --git a/.eslintrc b/.eslintrc
new file mode 100644
index 0000000..8b84b0f
--- /dev/null
+++ b/.eslintrc
@@ -0,0 +1,30 @@
+{
+    "parser": "@typescript-eslint/parser",
+    "extends": [
+      "eslint:recommended",
+      "plugin:@typescript-eslint/recommended",
+      "prettier/@typescript-eslint",
+      "plugin:prettier/recommended"
+    ],
+    "env": {
+      "node": true,
+      "es6": true
+    },
+    "parserOptions": {
+      "sourceType": "module",
+      "ecmaVersion": 2015,
+      "ecmaFeatures": {
+        "modules": true
+      }
+    },
+    "rules": {
+      "prettier/prettier": "error",
+      "indent": 0,
+      "camelcase": 0,
+      "@typescript-eslint/camelcase": 0,
+      "@typescript-eslint/explicit-function-return-type": "off"
+    },
+    "plugins": [
+      "@typescript-eslint"
+    ]
+  }
\ No newline at end of file
diff --git a/.gitignore b/.gitignore
index e9ea765..b74515d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 node_modules
-config.js
+config/index.ts
 storage
\ No newline at end of file
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 0000000..4cc587f
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,6 @@
+{
+  "recommendations": [
+    "esbenp.prettier-vscode",
+    "dbaeumer.vscode-eslint"
+  ]
+}
\ No newline at end of file
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..4672b28
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,10 @@
+{
+  "eslint.autoFixOnSave": true,
+  "eslint.validate": [
+    "javascript",
+    {
+      "language": "typescript",
+      "autoFix": true
+    },
+  ]
+}
\ No newline at end of file
diff --git a/Makefile b/Makefile
index d0da94f..f3e4007 100644
--- a/Makefile
+++ b/Makefile
@@ -4,5 +4,5 @@ start:
 serveo:
 	npm run serveo
 
-format:
-	npm run format
\ No newline at end of file
+lint:
+	npm run lint
\ No newline at end of file
diff --git a/kubernetes/deployment.yaml b/kubernetes/deployment.yaml
index 4d99277..d0dba3f 100644
--- a/kubernetes/deployment.yaml
+++ b/kubernetes/deployment.yaml
@@ -53,9 +53,9 @@ spec:
         image: gcr.io/htn-techyon/mentorship-slackbot
         volumeMounts:
           - name: mentorship-slackbot-secret
-            mountPath: /srv/config.js
+            mountPath: /srv/src/config/index.ts
             readOnly: true
-            subPath: config.js
+            subPath: config.ts
           - name: mentorship-slackbot-disk
             mountPath: /srv/storage
         resources:
diff --git a/package-lock.json b/package-lock.json
index 66585e9..f0092c8 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,11 +4,36 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
+      "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.0.0"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.5.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.5.0.tgz",
+      "integrity": "sha512-7dV4eu9gBxoM0dAnj/BCFDW9LFU0zvTrkq0ugM7pnHEgguOEeOz1so2ZghEdzviYzQEED0r4EAgpsBChKy1TRQ==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
     "@slack/events-api": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/@slack/events-api/-/events-api-2.2.0.tgz",
-      "integrity": "sha512-3PDcBSq0vfu8rnNmz+GYjzzuuKs4E5Tj7sZzLlOdzjXvgbvb0Q8VqgSCzRk9+9ZTImrjliac41KMo2HYHW+57w==",
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/@slack/events-api/-/events-api-2.3.0.tgz",
+      "integrity": "sha512-Chsp2+zVneo0Y7CU/RsqxS7Z1SAoEjMJJ2/K83gN6VHjeCigATF2A8mLQXXqmjUFaH4sHgTRaxjzhCfhFrqrBA==",
       "requires": {
+        "@types/debug": "^4.1.4",
+        "@types/express": "^4.17.0",
+        "@types/lodash.isstring": "^4.0.6",
+        "@types/node": ">=4.2.0",
+        "@types/yargs": "^13.0.0",
         "debug": "^2.6.1",
         "express": "^4.0.0",
         "lodash.isstring": "^4.0.1",
@@ -17,26 +42,6 @@
         "yargs": "^6.6.0"
       },
       "dependencies": {
-        "ansi-regex": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
-          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
-        },
-        "camelcase": {
-          "version": "3.0.0",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-3.0.0.tgz",
-          "integrity": "sha1-MvxLn82vhF/N9+c7uXysImHwqwo="
-        },
-        "cliui": {
-          "version": "3.2.0",
-          "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz",
-          "integrity": "sha1-EgYBU3qRbSmUD5NNo7SNWFo5IT0=",
-          "requires": {
-            "string-width": "^1.0.1",
-            "strip-ansi": "^3.0.1",
-            "wrap-ansi": "^2.0.0"
-          }
-        },
         "debug": {
           "version": "2.6.9",
           "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
@@ -44,99 +49,20 @@
           "requires": {
             "ms": "2.0.0"
           }
-        },
-        "invert-kv": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/invert-kv/-/invert-kv-1.0.0.tgz",
-          "integrity": "sha1-EEqOSqym09jNFXqO+L+rLXo//bY="
-        },
-        "is-fullwidth-code-point": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
-          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
-          "requires": {
-            "number-is-nan": "^1.0.0"
-          }
-        },
-        "lcid": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/lcid/-/lcid-1.0.0.tgz",
-          "integrity": "sha1-MIrMr6C8SDo4Z7S28rlQYlHRuDU=",
-          "requires": {
-            "invert-kv": "^1.0.0"
-          }
-        },
-        "os-locale": {
-          "version": "1.4.0",
-          "resolved": "https://registry.npmjs.org/os-locale/-/os-locale-1.4.0.tgz",
-          "integrity": "sha1-IPnxeuKe00XoveWDsT0gCYA8FNk=",
-          "requires": {
-            "lcid": "^1.0.0"
-          }
-        },
-        "string-width": {
-          "version": "1.0.2",
-          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
-          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
-          "requires": {
-            "code-point-at": "^1.0.0",
-            "is-fullwidth-code-point": "^1.0.0",
-            "strip-ansi": "^3.0.0"
-          }
-        },
-        "strip-ansi": {
-          "version": "3.0.1",
-          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
-          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
-          "requires": {
-            "ansi-regex": "^2.0.0"
-          }
-        },
-        "which-module": {
-          "version": "1.0.0",
-          "resolved": "https://registry.npmjs.org/which-module/-/which-module-1.0.0.tgz",
-          "integrity": "sha1-u6Y8qGGUiZT/MHc2CJ47lgJsKk8="
-        },
-        "y18n": {
-          "version": "3.2.1",
-          "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
-          "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE="
-        },
-        "yargs": {
-          "version": "6.6.0",
-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-6.6.0.tgz",
-          "integrity": "sha1-eC7CHvQDNF+DCoCMo9UTr1YGUgg=",
-          "requires": {
-            "camelcase": "^3.0.0",
-            "cliui": "^3.2.0",
-            "decamelize": "^1.1.1",
-            "get-caller-file": "^1.0.1",
-            "os-locale": "^1.4.0",
-            "read-pkg-up": "^1.0.1",
-            "require-directory": "^2.1.1",
-            "require-main-filename": "^1.0.1",
-            "set-blocking": "^2.0.0",
-            "string-width": "^1.0.2",
-            "which-module": "^1.0.0",
-            "y18n": "^3.2.1",
-            "yargs-parser": "^4.2.0"
-          }
-        },
-        "yargs-parser": {
-          "version": "4.2.1",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-4.2.1.tgz",
-          "integrity": "sha1-KczqwNxPA8bIe0qfIX3RjJ90hxw=",
-          "requires": {
-            "camelcase": "^3.0.0"
-          }
         }
       }
     },
     "@slack/interactive-messages": {
-      "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/@slack/interactive-messages/-/interactive-messages-1.1.1.tgz",
-      "integrity": "sha512-FIyj/sBmCjQ4B4Tt1z6MNdFmgvyT5CK2U2VrWGcdqdynxQk8tlN/AA/C0SSc5wIr/WNYck1c90ZawQJTlw3YsQ==",
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/@slack/interactive-messages/-/interactive-messages-1.3.0.tgz",
+      "integrity": "sha512-AMFQYuS2RTywTNAz8XqEdKpZTKozrS6BCtFoYHfJbxqsQQb7WnnxvdWxWmVk9Ih82+ASrJNlg/INVC7tu1lBIA==",
       "requires": {
+        "@types/debug": "^4.1.4",
+        "@types/express": "^4.17.0",
+        "@types/lodash.isfunction": "^3.0.6",
+        "@types/lodash.isregexp": "^4.0.6",
+        "@types/lodash.isstring": "^4.0.6",
+        "@types/node": ">=4.2.0",
         "axios": "^0.18.0",
         "debug": "^3.1.0",
         "lodash.isfunction": "^3.0.9",
@@ -156,9 +82,9 @@
       }
     },
     "@slack/types": {
-      "version": "1.0.0",
-      "resolved": "https://registry.npmjs.org/@slack/types/-/types-1.0.0.tgz",
-      "integrity": "sha512-IktC4uD/CHfLQcSitKSmjmRu4a6+Nf/KzfS6dTgUlDzENhh26l8aESKAuIpvYD5VOOE6NxDDIAdPJOXBvUGxlg=="
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@slack/types/-/types-1.2.1.tgz",
+      "integrity": "sha512-NyGh7MibW+a0OHkwwOPlv63hC639dzQdkFy4dj0tl4sAdZR4OBaE/OhXixKhCzcT3kJsPXaQmvkUN7sqSf52iA=="
     },
     "@slack/web-api": {
       "version": "5.0.1",
@@ -179,6 +105,58 @@
         "p-retry": "^4.0.0"
       }
     },
+    "@types/body-parser": {
+      "version": "1.17.1",
+      "resolved": "https://registry.npmjs.org/@types/body-parser/-/body-parser-1.17.1.tgz",
+      "integrity": "sha512-RoX2EZjMiFMjZh9lmYrwgoP9RTpAjSHiJxdp4oidAQVO02T7HER3xj9UKue5534ULWeqVEkujhWcyvUce+d68w==",
+      "requires": {
+        "@types/connect": "*",
+        "@types/node": "*"
+      }
+    },
+    "@types/caseless": {
+      "version": "0.12.2",
+      "resolved": "https://registry.npmjs.org/@types/caseless/-/caseless-0.12.2.tgz",
+      "integrity": "sha512-6ckxMjBBD8URvjB6J3NcnuAn5Pkl7t3TizAg+xdlzzQGSPSmBcXf8KoIH0ua/i+tio+ZRUHEXp0HEmvaR4kt0w=="
+    },
+    "@types/connect": {
+      "version": "3.4.32",
+      "resolved": "https://registry.npmjs.org/@types/connect/-/connect-3.4.32.tgz",
+      "integrity": "sha512-4r8qa0quOvh7lGD0pre62CAb1oni1OO6ecJLGCezTmhQ8Fz50Arx9RUszryR8KlgK6avuSXvviL6yWyViQABOg==",
+      "requires": {
+        "@types/node": "*"
+      }
+    },
+    "@types/debug": {
+      "version": "4.1.5",
+      "resolved": "https://registry.npmjs.org/@types/debug/-/debug-4.1.5.tgz",
+      "integrity": "sha512-Q1y515GcOdTHgagaVFhHnIFQ38ygs/kmxdNpvpou+raI9UO3YZcHDngBSYKQklcKlvA7iuQlmIKbzvmxcOE9CQ=="
+    },
+    "@types/eslint-visitor-keys": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@types/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz",
+      "integrity": "sha512-OCutwjDZ4aFS6PB1UZ988C4YgwlBHJd6wCeQqaLdmadZ/7e+w79+hbMUFC1QXDNCmdyoRfAFdm0RypzwR+Qpag==",
+      "dev": true
+    },
+    "@types/express": {
+      "version": "4.17.1",
+      "resolved": "https://registry.npmjs.org/@types/express/-/express-4.17.1.tgz",
+      "integrity": "sha512-VfH/XCP0QbQk5B5puLqTLEeFgR8lfCJHZJKkInZ9mkYd+u8byX0kztXEQxEk4wZXJs8HI+7km2ALXjn4YKcX9w==",
+      "requires": {
+        "@types/body-parser": "*",
+        "@types/express-serve-static-core": "*",
+        "@types/serve-static": "*"
+      }
+    },
+    "@types/express-serve-static-core": {
+      "version": "4.16.9",
+      "resolved": "https://registry.npmjs.org/@types/express-serve-static-core/-/express-serve-static-core-4.16.9.tgz",
+      "integrity": "sha512-GqpaVWR0DM8FnRUJYKlWgyARoBUAVfRIeVDZQKOttLFp5SmhhF9YFIYeTPwMd/AXfxlP7xVO2dj1fGu0Q+krKQ==",
+      "requires": {
+        "@types/node": "*",
+        "@types/range-parser": "*"
+      }
+    },
     "@types/form-data": {
       "version": "2.2.1",
       "resolved": "https://registry.npmjs.org/@types/form-data/-/form-data-2.2.1.tgz",
@@ -195,21 +173,181 @@
         "@types/node": "*"
       }
     },
+    "@types/json-schema": {
+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/@types/json-schema/-/json-schema-7.0.3.tgz",
+      "integrity": "sha512-Il2DtDVRGDcqjDtE+rF8iqg1CArehSK84HZJCT7AMITlyXRBpuPhqGLDQMowraqqu1coEaimg4ZOqggt6L6L+A==",
+      "dev": true
+    },
+    "@types/lodash": {
+      "version": "4.14.144",
+      "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.144.tgz",
+      "integrity": "sha512-ogI4g9W5qIQQUhXAclq6zhqgqNUr7UlFaqDHbch7WLSLeeM/7d3CRaw7GLajxvyFvhJqw4Rpcz5bhoaYtIx6Tg=="
+    },
+    "@types/lodash.isfunction": {
+      "version": "3.0.6",
+      "resolved": "https://registry.npmjs.org/@types/lodash.isfunction/-/lodash.isfunction-3.0.6.tgz",
+      "integrity": "sha512-olhgKmBgzHnA5pxsOI6YHunzTBMSyBw1XjxIKFio8W+XhYiELGTt05FStE0suV0GWtlIMdn7V8M/UbYbSVdGYw==",
+      "requires": {
+        "@types/lodash": "*"
+      }
+    },
+    "@types/lodash.isregexp": {
+      "version": "4.0.6",
+      "resolved": "https://registry.npmjs.org/@types/lodash.isregexp/-/lodash.isregexp-4.0.6.tgz",
+      "integrity": "sha512-+MxWeayd6d0xdLuLA6T3kY7uNdfHH82m4gsxgpcQkpHcqEmXJiTWDrfUhDdlmErAn6tlj5zhjKsV0mQEkfJcfA==",
+      "requires": {
+        "@types/lodash": "*"
+      }
+    },
+    "@types/lodash.isstring": {
+      "version": "4.0.6",
+      "resolved": "https://registry.npmjs.org/@types/lodash.isstring/-/lodash.isstring-4.0.6.tgz",
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+      "requires": {
+        "@types/lodash": "*"
+      }
+    },
+    "@types/lowdb": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/@types/lowdb/-/lowdb-1.0.9.tgz",
+      "integrity": "sha512-LBRG5EPXFOJDoJc9jACstMhtMP+u+UkPYllBeGQXXKiaHc+uzJs9+/Aynb/5KkX33DtrIiKyzNVTPQc/4RcD6A==",
+      "dev": true,
+      "requires": {
+        "@types/lodash": "*"
+      }
+    },
+    "@types/mime": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/@types/mime/-/mime-2.0.1.tgz",
+      "integrity": "sha512-FwI9gX75FgVBJ7ywgnq/P7tw+/o1GUbtP0KzbtusLigAOgIgNISRK0ZPl4qertvXSIE8YbsVJueQ90cDt9YYyw=="
+    },
     "@types/node": {
-      "version": "12.0.2",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.0.2.tgz",
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+      "version": "12.7.12",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.7.12.tgz",
+      "integrity": "sha512-KPYGmfD0/b1eXurQ59fXD1GBzhSQfz6/lKBxkaHX9dKTzjXbK68Zt7yGUxUsCS1jeTy/8aL+d9JEr+S54mpkWQ=="
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     "@types/p-queue": {
       "version": "2.3.2",
       "resolved": "https://registry.npmjs.org/@types/p-queue/-/p-queue-2.3.2.tgz",
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     },
+    "@types/range-parser": {
+      "version": "1.2.3",
+      "resolved": "https://registry.npmjs.org/@types/range-parser/-/range-parser-1.2.3.tgz",
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+    },
+    "@types/request": {
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+      "resolved": "https://registry.npmjs.org/@types/request/-/request-2.48.3.tgz",
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+      "requires": {
+        "@types/caseless": "*",
+        "@types/node": "*",
+        "@types/tough-cookie": "*",
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+      },
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+          "version": "2.5.1",
+          "resolved": "https://registry.npmjs.org/form-data/-/form-data-2.5.1.tgz",
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+            "asynckit": "^0.4.0",
+            "combined-stream": "^1.0.6",
+            "mime-types": "^2.1.12"
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+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-1.2.0.tgz",
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+      "dev": true,
+      "requires": {
+        "shebang-regex": "^1.0.0"
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+    "shebang-regex": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-1.0.0.tgz",
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+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.13.tgz",
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@@ -1173,9 +2171,15 @@
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-      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.4.tgz",
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+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/spdx-license-ids/-/spdx-license-ids-3.0.5.tgz",
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+    },
+    "sprintf-js": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/sprintf-js/-/sprintf-js-1.0.3.tgz",
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+      "dev": true
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       "version": "1.16.1",
@@ -1206,6 +2210,44 @@
         "graceful-fs": "^4.1.3"
       }
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+      "requires": {
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+        "strip-ansi": "^4.0.0"
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+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "dev": true,
+          "requires": {
+            "ansi-regex": "^3.0.0"
+          }
+        }
+      }
+    },
+    "strip-ansi": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-5.2.0.tgz",
+      "integrity": "sha512-DuRs1gKbBqsMKIZlrffwlug8MHkcnpjs5VPmL1PAh+mA30U0DTotfDZ0d2UUsXpPmPmMMJ6W773MaA3J+lbiWA==",
+      "dev": true,
+      "requires": {
+        "ansi-regex": "^4.1.0"
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+          "version": "4.1.0",
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+          "dev": true
+        }
+      }
+    },
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       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-2.0.0.tgz",
@@ -1214,6 +2256,67 @@
         "is-utf8": "^0.2.0"
       }
     },
+    "strip-json-comments": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.0.1.tgz",
+      "integrity": "sha512-VTyMAUfdm047mwKl+u79WIdrZxtFtn+nBxHeb844XBQ9uMNTuTHdx2hc5RiAJYqwTj3wc/xe5HLSdJSkJ+WfZw==",
+      "dev": true
+    },
+    "supports-color": {
+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
+      "integrity": "sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==",
+      "dev": true,
+      "requires": {
+        "has-flag": "^3.0.0"
+      }
+    },
+    "table": {
+      "version": "5.4.6",
+      "resolved": "https://registry.npmjs.org/table/-/table-5.4.6.tgz",
+      "integrity": "sha512-wmEc8m4fjnob4gt5riFRtTu/6+4rSe12TpAELNSqHMfF3IqnA+CH37USM6/YR3qRZv7e56kAEAtd6nKZaxe0Ug==",
+      "dev": true,
+      "requires": {
+        "ajv": "^6.10.2",
+        "lodash": "^4.17.14",
+        "slice-ansi": "^2.1.0",
+        "string-width": "^3.0.0"
+      },
+      "dependencies": {
+        "string-width": {
+          "version": "3.1.0",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-3.1.0.tgz",
+          "integrity": "sha512-vafcv6KjVZKSgz06oM/H6GDBrAtz8vdhQakGjFIvNrHA6y3HCF1CInLy+QLq8dTJPQ1b+KDUqDFctkdRW44e1w==",
+          "dev": true,
+          "requires": {
+            "emoji-regex": "^7.0.1",
+            "is-fullwidth-code-point": "^2.0.0",
+            "strip-ansi": "^5.1.0"
+          }
+        }
+      }
+    },
+    "text-table": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/text-table/-/text-table-0.2.0.tgz",
+      "integrity": "sha1-f17oI66AUgfACvLfSoTsP8+lcLQ=",
+      "dev": true
+    },
+    "through": {
+      "version": "2.3.8",
+      "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
+      "integrity": "sha1-DdTJ/6q8NXlgsbckEV1+Doai4fU=",
+      "dev": true
+    },
+    "tmp": {
+      "version": "0.0.33",
+      "resolved": "https://registry.npmjs.org/tmp/-/tmp-0.0.33.tgz",
+      "integrity": "sha512-jRCJlojKnZ3addtTOjdIqoRuPEKBvNXcGYqzO6zWZX8KfKEpnGY5jfggJQ3EjKuu8D4bJRr0y+cYJFmYbImXGw==",
+      "dev": true,
+      "requires": {
+        "os-tmpdir": "~1.0.2"
+      }
+    },
     "toidentifier": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
@@ -1235,11 +2338,37 @@
         }
       }
     },
+    "ts-node": {
+      "version": "8.4.1",
+      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-8.4.1.tgz",
+      "integrity": "sha512-5LpRN+mTiCs7lI5EtbXmF/HfMeCjzt7DH9CZwtkr6SywStrNQC723wG+aOWFiLNn7zT3kD/RnFqi3ZUfr4l5Qw==",
+      "requires": {
+        "arg": "^4.1.0",
+        "diff": "^4.0.1",
+        "make-error": "^1.1.1",
+        "source-map-support": "^0.5.6",
+        "yn": "^3.0.0"
+      }
+    },
+    "tslib": {
+      "version": "1.10.0",
+      "resolved": "https://registry.npmjs.org/tslib/-/tslib-1.10.0.tgz",
+      "integrity": "sha512-qOebF53frne81cf0S9B41ByenJ3/IuH8yJKngAX35CmiZySA0khhkovshKK+jGCaMnVomla7gVlIcc3EvKPbTQ=="
+    },
     "tsscmp": {
       "version": "1.0.6",
       "resolved": "https://registry.npmjs.org/tsscmp/-/tsscmp-1.0.6.tgz",
       "integrity": "sha512-LxhtAkPDTkVCMQjt2h6eBVY28KCjikZqZfMcC15YBeNjkgUpdCfBu5HoiOTDu86v6smE8yOjyEktJ8hlbANHQA=="
     },
+    "tsutils": {
+      "version": "3.17.1",
+      "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-3.17.1.tgz",
+      "integrity": "sha512-kzeQ5B8H3w60nFY2g8cJIuH7JDpsALXySGtwGJ0p2LSjLgay3NdIpqq5SoOBe46bKDW2iq25irHCr8wjomUS2g==",
+      "dev": true,
+      "requires": {
+        "tslib": "^1.8.1"
+      }
+    },
     "tunnel-agent": {
       "version": "0.6.0",
       "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
@@ -1253,6 +2382,15 @@
       "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz",
       "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q="
     },
+    "type-check": {
+      "version": "0.3.2",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.2.tgz",
+      "integrity": "sha1-WITKtRLPHTVeP7eE8wgEsrUg23I=",
+      "dev": true,
+      "requires": {
+        "prelude-ls": "~1.1.2"
+      }
+    },
     "type-is": {
       "version": "1.6.18",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
@@ -1262,6 +2400,11 @@
         "mime-types": "~2.1.24"
       }
     },
+    "typescript": {
+      "version": "3.6.4",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.6.4.tgz",
+      "integrity": "sha512-unoCll1+l+YK4i4F8f22TaNVPRHcD9PA3yCuZ8g5e0qGqlVlJ/8FSateOLLSagn+Yg5+ZwuPkL8LFUc0Jcvksg=="
+    },
     "unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
@@ -1285,6 +2428,12 @@
       "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
       "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA=="
     },
+    "v8-compile-cache": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/v8-compile-cache/-/v8-compile-cache-2.1.0.tgz",
+      "integrity": "sha512-usZBT3PW+LOjM25wbqIlZwPeJV+3OSz3M1k1Ws8snlW39dZyYL9lOGC5FgPVHfk0jKmjiDV8Z0mIbVQPiwFs7g==",
+      "dev": true
+    },
     "validate-npm-package-license": {
       "version": "3.0.4",
       "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
@@ -1309,6 +2458,26 @@
         "extsprintf": "^1.2.0"
       }
     },
+    "which": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "dev": true,
+      "requires": {
+        "isexe": "^2.0.0"
+      }
+    },
+    "which-module": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-1.0.0.tgz",
+      "integrity": "sha1-u6Y8qGGUiZT/MHc2CJ47lgJsKk8="
+    },
+    "wordwrap": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
+      "dev": true
+    },
     "wrap-ansi": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
@@ -1350,6 +2519,92 @@
           }
         }
       }
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "write": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/write/-/write-1.0.3.tgz",
+      "integrity": "sha512-/lg70HAjtkUgWPVZhZcm+T4hkL8Zbtp1nFNOn3lRrxnlv50SRBv7cR7RqR+GMsd3hUXy9hWBo4CHTbFTcOYwig==",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
+    "y18n": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-3.2.1.tgz",
+      "integrity": "sha1-bRX7qITAhnnA136I53WegR4H+kE="
+    },
+    "yargs": {
+      "version": "6.6.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-6.6.0.tgz",
+      "integrity": "sha1-eC7CHvQDNF+DCoCMo9UTr1YGUgg=",
+      "requires": {
+        "camelcase": "^3.0.0",
+        "cliui": "^3.2.0",
+        "decamelize": "^1.1.1",
+        "get-caller-file": "^1.0.1",
+        "os-locale": "^1.4.0",
+        "read-pkg-up": "^1.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^1.0.1",
+        "set-blocking": "^2.0.0",
+        "string-width": "^1.0.2",
+        "which-module": "^1.0.0",
+        "y18n": "^3.2.1",
+        "yargs-parser": "^4.2.0"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8="
+        },
+        "is-fullwidth-code-point": {
+          "version": "1.0.0",
+          "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-1.0.0.tgz",
+          "integrity": "sha1-754xOG8DGn8NZDr4L95QxFfvAMs=",
+          "requires": {
+            "number-is-nan": "^1.0.0"
+          }
+        },
+        "string-width": {
+          "version": "1.0.2",
+          "resolved": "https://registry.npmjs.org/string-width/-/string-width-1.0.2.tgz",
+          "integrity": "sha1-EYvfW4zcUaKn5w0hHgfisLmxB9M=",
+          "requires": {
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
+          }
+        },
+        "strip-ansi": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-3.0.1.tgz",
+          "integrity": "sha1-ajhfuIU9lS1f8F0Oiq+UJ43GPc8=",
+          "requires": {
+            "ansi-regex": "^2.0.0"
+          }
+        }
+      }
+    },
+    "yargs-parser": {
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-4.2.1.tgz",
+      "integrity": "sha1-KczqwNxPA8bIe0qfIX3RjJ90hxw=",
+      "requires": {
+        "camelcase": "^3.0.0"
+      }
+    },
+    "yn": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
+      "integrity": "sha512-Ux4ygGWsu2c7isFWe8Yu1YluJmqVhxqK2cLXNQA5AcC3QfbGNpM7fu0Y8b/z16pXLnFxZYvWhd3fhBY9DLmC6Q=="
     }
   }
 }
diff --git a/package.json b/package.json
index 3153b41..e8dca56 100644
--- a/package.json
+++ b/package.json
@@ -4,9 +4,9 @@
   "description": "## General overview",
   "main": "index.js",
   "scripts": {
-    "format": "prettier --write src/**/*.js",
-    "start": "node src/server.js",
-    "serveo": "ssh -R test-mentorship:80:localhost:3000 serveo.net"
+    "start": "ts-node src/server.js",
+    "serveo": "ssh -R test-mentorship:80:localhost:3000 serveo.net",
+    "lint": "eslint --ext .jsx,.js,.tsx,.ts src/ --fix"
   },
   "repository": {
     "type": "git",
@@ -19,16 +19,28 @@
   },
   "homepage": "https://github.com/hackathon/mentorship-slackbot#readme",
   "devDependencies": {
+    "@types/lowdb": "^1.0.9",
+    "@typescript-eslint/eslint-plugin": "^2.3.3",
+    "@typescript-eslint/parser": "^2.3.3",
+    "eslint": "^6.5.1",
+    "eslint-config-prettier": "^6.4.0",
+    "eslint-plugin-prettier": "^3.1.1",
     "prettier": "^1.18.2"
   },
   "dependencies": {
-    "@slack/events-api": "^2.2.0",
-    "@slack/interactive-messages": "^1.1.1",
+    "@slack/events-api": "^2.3.0",
+    "@slack/interactive-messages": "^1.3.0",
     "@slack/web-api": "^5.0.1",
+    "@types/express": "^4.17.1",
+    "@types/node": "^12.7.12",
+    "@types/request": "^2.48.3",
     "body-parser": "^1.19.0",
     "express": "^4.17.1",
     "lowdb": "^1.0.0",
     "moniker": "^0.1.2",
-    "request": "^2.88.0"
+    "request": "^2.88.0",
+    "ts-node": "^8.4.1",
+    "tslib": "^1.10.0",
+    "typescript": "^3.6.4"
   }
 }
diff --git a/src/actions/message.js b/src/actions/message.ts
similarity index 51%
rename from src/actions/message.js
rename to src/actions/message.ts
index cc50804..c8d0299 100644
--- a/src/actions/message.js
+++ b/src/actions/message.ts
@@ -1,19 +1,50 @@
-const { web } = require("../clients");
+import config from "config";
 
-const db = require("../db");
+import { webClient } from "clients";
+import * as db from "db";
+import Text from "text";
+import {
+  ActiveSession,
+  isClaimed,
+  TS,
+  Session,
+  ChannelID,
+  ClaimedSession,
+  UserID,
+  Skills
+} from "typings";
+import { ChatUpdateArguments, ChatPostMessageArguments } from "@slack/web-api";
 
-const {
-  BOT_USERNAME,
-  SKILLS,
-  CHANNEL_ID,
-  STATS_CHANNEL_ID
-} = require("../../config");
+export const { chat, dialog } = webClient;
 
-const Text = require("../text");
+export const MENTOR_GROUP_CHANNEL = config.CHANNEL_ID;
 
-const mentor_group_channel = CHANNEL_ID;
+type Context =
+  | "deleted"
+  | "canceled"
+  | "mentee"
+  | "mentee_completed"
+  | "intro"
+  | null;
 
-const buildMentorRequestActions = (session, context) => {
+function postMessage(value: ChatPostMessageArguments) {
+  return chat.postMessage({
+    as_user: true,
+    username: config.BOT_USERNAME,
+    ...value
+  });
+}
+function update(value: ChatUpdateArguments) {
+  return chat.update({
+    as_user: true,
+    ...value
+  });
+}
+
+export const buildMentorRequestActions = (
+  session: ActiveSession,
+  context: Context
+) => {
   switch (context) {
     case "deleted":
       return [
@@ -72,7 +103,7 @@ const buildMentorRequestActions = (session, context) => {
       return [];
     case null:
       return [
-        session.mentor != null
+        isClaimed(session)
           ? {
               type: "context",
               elements: [
@@ -112,55 +143,63 @@ const buildMentorRequestActions = (session, context) => {
   }
 };
 
-const buildMentorRequest = (session, context = null) => {
+export const buildMentorRequest = (
+  session: ActiveSession,
+  context: Context = null
+) => {
   const actions = buildMentorRequestActions(session, context);
-  let mentors = [];
+  let mentors: string[] = [];
   if (context == null && session.submission.skill != null) {
     const allMentors = db.getMentors();
     mentors = Object.keys(allMentors).filter(
       m => allMentors[m].skills[session.submission.skill] === true
     );
   }
-  return [
-    {
-      type: "divider"
-    },
-    {
-      type: "context",
-      block_id: "mentor_request",
-      elements: [
-        {
+
+  const title = Text.MENTOR_REQUEST_TITLE(
+    session.username,
+    session.submission,
+    mentors
+  );
+  const details = Text.MENTOR_REQUEST_DETAILS(session.submission);
+
+  return {
+    text: title + " " + details,
+    blocks: [
+      {
+        type: "divider"
+      },
+      {
+        type: "context",
+        block_id: "mentor_request",
+        elements: [
+          {
+            type: "mrkdwn",
+            text: title
+          }
+        ]
+      },
+      {
+        type: "section",
+        text: {
           type: "mrkdwn",
-          text: Text.MENTOR_REQUEST_TITLE(
-            session.username,
-            session.submission,
-            mentors
-          )
+          text: details
         }
-      ]
-    },
-    {
-      type: "section",
-      text: {
-        type: "mrkdwn",
-        text: Text.MENTOR_REQUEST_DETAILS(session.submission)
-      }
-    },
-    ...actions
-  ];
+      },
+      ...actions
+    ]
+  };
 };
 
-const postMentorRequest = session => {
-  return web.chat.postMessage({
-    channel: mentor_group_channel,
-    blocks: buildMentorRequest(session),
-    as_user: true,
-    username: BOT_USERNAME
+export const postMentorRequest = (session: ActiveSession) => {
+  return postMessage({
+    channel: MENTOR_GROUP_CHANNEL,
+    ...buildMentorRequest(session)
   });
 };
 
-const openMentorRequestDialog = (trigger_id, ts) => {
-  web.dialog.open({
+export const openMentorRequestDialog = (trigger_id: string, ts: TS) => {
+  dialog.open({
     trigger_id,
     dialog: {
       callback_id: "mentor_request",
@@ -180,8 +219,8 @@ const openMentorRequestDialog = (trigger_id, ts) => {
           name: "skill",
           type: "select",
           optional: true,
-          options: Object.keys(SKILLS).map(value => ({
-            label: SKILLS[value],
+          options: Object.keys(config.SKILLS).map(value => ({
+            label: config.SKILLS[value],
             value
           }))
         },
@@ -196,42 +235,40 @@ const openMentorRequestDialog = (trigger_id, ts) => {
   });
 };
 
-const confirmMentorRequest = session => {
-  web.chat.update({
+export const confirmMentorRequest = (session: ActiveSession) => {
+  update({
     channel: session.channel,
     ts: session.mentee_ts,
-    blocks: buildMentorRequest(session, "mentee"),
-    as_user: true,
-    username: BOT_USERNAME
+    ...buildMentorRequest(session, "mentee")
   });
 };
 
-const bumpMentorRequest = session => {
-  web.chat
+export const bumpMentorRequest = (session: ActiveSession) => {
+  chat
     .getPermalink({
-      channel: mentor_group_channel,
+      channel: MENTOR_GROUP_CHANNEL,
       message_ts: session.ts
     })
     .then(({ permalink }) => {
-      web.chat.postMessage({
-        channel: mentor_group_channel,
+      const text = Text.BUMP(permalink as string, session);
+      postMessage({
+        channel: MENTOR_GROUP_CHANNEL,
+        text,
         blocks: [
           {
             type: "section",
             text: {
               type: "mrkdwn",
-              text: Text.BUMP(permalink, session)
+              text
             }
           }
         ],
-        unfurl_links: true,
-        as_user: true,
-        username: BOT_USERNAME
+        unfurl_links: true
       });
     });
 };
 
-const requestActionBlock = {
+export const requestActionBlock = {
   type: "actions",
   elements: [
     {
@@ -246,16 +283,17 @@ const requestActionBlock = {
   ]
 };
 
-const welcome = session => {
-  web.chat.postMessage({
+export const welcome = (session: Session) => {
+  const text = Text.WELCOME(session.name);
+  postMessage({
     channel: session.channel,
-    text: Text.WELCOME(session.name),
+    text,
     blocks: [
       {
         type: "section",
         text: {
           type: "mrkdwn",
-          text: Text.WELCOME(session.name)
+          text
         }
       },
       {
@@ -266,62 +304,53 @@ const welcome = session => {
         }
       },
       requestActionBlock
-    ],
-    as_user: true,
-    username: BOT_USERNAME
+    ]
   });
 };
 
-const noSession = ({ channel }) => {
-  web.chat
-    .postMessage({
-      channel,
-      text: Text.NO_SESSION,
-      blocks: [
-        {
-          type: "section",
-          text: { type: "mrkdwn", text: Text.NO_SESSION }
-        },
-        requestActionBlock
-      ],
-      as_user: true,
-      username: BOT_USERNAME
-    })
-    .catch(console.error);
+export const noSession = ({ channel }: Session) => {
+  const text = Text.NO_SESSION;
+  postMessage({
+    channel,
+    text,
+    blocks: [
+      {
+        type: "section",
+        text: { type: "mrkdwn", text }
+      },
+      requestActionBlock
+    ]
+  }).catch(console.error);
 };
-const noUnderstand = ({ channel }) => {
-  web.chat
-    .postMessage({
-      channel,
-      blocks: [
-        {
-          type: "section",
-          text: { type: "mrkdwn", text: Text.NO_UNDERSTAND }
-        }
-      ],
-      as_user: true,
-      username: BOT_USERNAME
-    })
-    .catch(console.error);
+export const noUnderstand = ({ channel }: Session) => {
+  const text = Text.NO_UNDERSTAND;
+  postMessage({
+    channel,
+    text,
+    blocks: [
+      {
+        type: "section",
+        text: { type: "mrkdwn", text }
+      }
+    ]
+  }).catch(console.error);
 };
-const noUnderstandMentor = channel => {
-  web.chat
-    .postMessage({
-      channel,
-      blocks: [
-        {
-          type: "section",
-          text: { type: "mrkdwn", text: Text.NO_UNDERSTAND_MENTOR }
-        }
-      ],
-      as_user: true,
-      username: BOT_USERNAME
-    })
-    .catch(console.error);
+export const noUnderstandMentor = (channel: ChannelID) => {
+  const text = Text.NO_UNDERSTAND_MENTOR;
+  postMessage({
+    channel,
+    text,
+    blocks: [
+      {
+        type: "section",
+        text: { type: "mrkdwn", text }
+      }
+    ]
+  }).catch(console.error);
 };
 
-const needMentor = ({ channel }) => {
-  web.chat.postMessage({
+export const needMentor = ({ channel }: Session) => {
+  postMessage({
     channel: channel,
     text: Text.NEED_MENTOR,
     blocks: [
@@ -333,47 +362,47 @@ const needMentor = ({ channel }) => {
         }
       },
       requestActionBlock
-    ],
-    as_user: true,
-    username: BOT_USERNAME
+    ]
   });
 };
 
-const sessionIntroduction = session => {
+export const sessionIntroduction = (session: ClaimedSession) => {
+  const { blocks } = buildMentorRequest(session, "intro");
+  const introText = Text.SESSION_INTRODUCTION(session);
   // update the new channel
-  web.chat.postMessage({
+  postMessage({
     channel: session.group_id,
+    text: introText,
     blocks: [
       {
         type: "section",
         text: {
           type: "mrkdwn",
-          text: Text.SESSION_INTRODUCTION(session)
+          text: introText
         }
       },
-      ...buildMentorRequest(session, "intro")
-    ],
-    as_user: true
+      ...blocks
+    ]
   });
 
   // update the existing user message
-  web.chat.update({
-    channel: mentor_group_channel,
+  update({
+    channel: MENTOR_GROUP_CHANNEL,
     ts: session.ts,
-    blocks: buildMentorRequest(session),
-    as_user: true,
-    username: BOT_USERNAME
+    ...buildMentorRequest(session)
   });
 
   // let the mentor know
-  return web.chat.postMessage({
+  const mentorText = Text.SESSION_CLAIMED(session);
+  return postMessage({
     channel: session.mentor,
+    text: mentorText,
     blocks: [
       {
         type: "section",
         text: {
           type: "mrkdwn",
-          text: Text.SESSION_CLAIMED(session)
+          text: mentorText
         }
       },
       {
@@ -410,240 +439,209 @@ const sessionIntroduction = session => {
           }
         ]
       }
-    ],
-    as_user: true
+    ]
   });
 };
 
-const sessionSurrendered = (session, newSession) => {
-  web.chat.update({
+export const sessionSurrendered = (
+  session: ClaimedSession,
+  newSession: ActiveSession
+) => {
+  const mentorText = Text.SESSION_SURRENDERED_MENTOR;
+  update({
     channel: session.mentor_channel,
     ts: session.mentor_claim_ts,
+    text: mentorText,
     blocks: [
       {
         type: "section",
         text: {
           type: "mrkdwn",
-          text: Text.SESSION_SURRENDERED_MENTOR
+          text: mentorText
         }
       }
-    ],
-    as_user: true
+    ]
   });
-  web.chat.update({
-    channel: mentor_group_channel,
+  update({
+    channel: MENTOR_GROUP_CHANNEL,
     ts: session.ts,
-    blocks: buildMentorRequest(newSession),
-    as_user: true,
-    username: BOT_USERNAME
+    ...buildMentorRequest(newSession)
   });
-  web.chat
+  chat
     .getPermalink({
-      channel: mentor_group_channel,
+      channel: MENTOR_GROUP_CHANNEL,
       message_ts: session.ts
     })
     .then(({ permalink }) => {
-      web.chat.postMessage({
-        channel: mentor_group_channel,
+      const text = Text.BUMP_SURRENDER(permalink as string, session);
+      postMessage({
+        channel: MENTOR_GROUP_CHANNEL,
+        text,
         blocks: [
           {
             type: "section",
             text: {
               type: "mrkdwn",
-              text: Text.BUMP_SURRENDER(permalink, session)
+              text
             }
           }
         ],
-        unfurl_links: true,
-        as_user: true,
-        username: BOT_USERNAME
+        unfurl_links: true
       });
     });
-  return web.chat.postMessage({
+  const text = Text.SESSION_SURRENDERED(session);
+  return postMessage({
     channel: session.group_id,
+    text,
     blocks: [
       {
         type: "section",
         text: {
           type: "mrkdwn",
-          text: Text.SESSION_SURRENDERED(session)
+          text
         }
       }
-    ],
-    as_user: true
+    ]
   });
 };
 
-const sessionCompleted = session => {
-  web.chat.update({
+export const sessionCompleted = (session: ClaimedSession) => {
+  const mentorText = Text.SESSION_COMPLETED_MENTOR;
+  update({
     channel: session.mentor_channel,
     ts: session.mentor_claim_ts,
+    text: mentorText,
     blocks: [
       {
         type: "section",
         text: {
           type: "mrkdwn",
-          text: Text.SESSION_COMPLETED_MENTOR
+          text: mentorText
         }
       }
-    ],
-    as_user: true
+    ]
   });
-  web.chat.update({
+  update({
     channel: session.channel,
     ts: session.mentee_ts,
-    blocks: buildMentorRequest(session, "mentee_completed"),
-    as_user: true,
-    username: BOT_USERNAME
+    ...buildMentorRequest(session, "mentee_completed")
   });
   noSession(session);
-  return web.chat.postMessage({
+  const text = Text.SESSION_COMPLETED(session);
+  return postMessage({
     channel: session.group_id,
+    text,
     blocks: [
       {
         type: "section",
         text: {
           type: "mrkdwn",
-          text: Text.SESSION_COMPLETED(session)
+          text
         }
       }
-    ],
-    as_user: true
+    ]
   });
 };
 
-const postSessionCanceled = session => {
-  web.chat.update({
+export const postSessionCanceled = (session: ActiveSession) => {
+  update({
     channel: session.channel,
     ts: session.mentee_ts,
-    blocks: buildMentorRequest(session, "canceled"),
-    as_user: true,
-    username: BOT_USERNAME
+    ...buildMentorRequest(session, "canceled")
   });
-  web.chat.update({
-    channel: mentor_group_channel,
+  update({
+    channel: MENTOR_GROUP_CHANNEL,
     ts: session.ts,
-    blocks: buildMentorRequest(session, "canceled"),
-    as_user: true,
-    username: BOT_USERNAME
+    ...buildMentorRequest(session, "canceled")
   });
 };
 
-const postSessionDeleted = session => {
-  const { channel, mentor_channel, mentee_ts, mentor_claim_ts, ts } = session;
-  web.chat.update({
-    channel: mentor_group_channel,
+export const postSessionDeleted = (session: ActiveSession) => {
+  const { channel, mentee_ts, ts } = session;
+  update({
+    channel: MENTOR_GROUP_CHANNEL,
     ts: ts,
-    blocks: buildMentorRequest(session, "deleted"),
-    as_user: true,
-    username: BOT_USERNAME
+    ...buildMentorRequest(session, "deleted")
   });
-  if (mentor_claim_ts != null) {
-    web.chat.update({
-      channel: mentor_channel,
-      ts: mentor_claim_ts,
+  if (isClaimed(session)) {
+    const mentorText = Text.SESSION_DELETED_MENTOR;
+    update({
+      channel: session.mentor_channel,
+      ts: session.mentor_claim_ts,
+      text: mentorText,
       blocks: [
         {
           type: "section",
           text: {
             type: "mrkdwn",
-            text: Text.SESSION_DELETED_MENTOR
+            text: mentorText
           }
         }
-      ],
-      as_user: true
+      ]
     });
   }
-  web.chat.update({
+  chat.update({
     channel,
     ts: mentee_ts,
-    blocks: buildMentorRequest(session, "deleted"),
-    as_user: true,
-    username: BOT_USERNAME
+    ...buildMentorRequest(session, "deleted")
   });
-  web.chat
-    .postMessage({
-      channel,
-      text: Text.SESSION_DELETED,
-      blocks: [
-        {
-          type: "section",
-          text: {
-            type: "mrkdwn",
-            text: Text.SESSION_DELETED
-          }
+  const text = Text.SESSION_DELETED;
+  postMessage({
+    channel,
+    text,
+    blocks: [
+      {
+        type: "section",
+        text: {
+          type: "mrkdwn",
+          text
         }
-      ],
-      as_user: true
-    })
-    .then(() => needMentor(session));
+      }
+    ]
+  }).then(() => needMentor(session));
 };
 
-const skillsHelp = channel => {
-  web.chat
-    .postMessage({
-      channel,
-      blocks: [
-        {
-          type: "section",
-          text: { type: "mrkdwn", text: Text.SKILLS_HELP(Object.keys(SKILLS)) }
-        }
-      ],
-      as_user: true,
-      username: BOT_USERNAME
-    })
-    .catch(console.error);
+export const skillsHelp = (channel: ChannelID) => {
+  const text = Text.SKILLS_HELP(Object.keys(config.SKILLS));
+  postMessage({
+    channel,
+    text,
+    blocks: [
+      {
+        type: "section",
+        text: { type: "mrkdwn", text }
+      }
+    ]
+  }).catch(console.error);
 };
 
-const skillsSet = (channel, newSkills) => {
-  web.chat
-    .postMessage({
-      channel,
-      blocks: [
-        {
-          type: "section",
-          text: { type: "mrkdwn", text: Text.SKILLS_SET(newSkills) }
-        }
-      ],
-      as_user: true,
-      username: BOT_USERNAME
-    })
-    .catch(console.error);
+export const skillsSet = (channel: UserID, newSkills: Skills) => {
+  const text = Text.SKILLS_SET(newSkills);
+  postMessage({
+    channel,
+    text,
+    blocks: [
+      {
+        type: "section",
+        text: { type: "mrkdwn", text }
+      }
+    ]
+  }).catch(console.error);
 };
 
-const stats = stats => {
-  web.chat.postMessage({
-    channel: STATS_CHANNEL_ID,
+export const stats = (stats: { created: number; online: number }) => {
+  const text = Text.STATS(stats);
+  postMessage({
+    channel: config.STATS_CHANNEL_ID,
+    text,
     blocks: [
       {
         type: "section",
         text: {
           type: "mrkdwn",
-          text: Text.STATS(stats)
+          text
         }
       }
-    ],
-    as_user: true,
-    username: BOT_USERNAME
+    ]
   });
 };
-
-module.exports = {
-  welcome,
-  needMentor,
-  noSession,
-  noUnderstand,
-  noUnderstandMentor,
-  openMentorRequestDialog,
-  confirmMentorRequest,
-  postMentorRequest,
-  postSessionDeleted,
-  postSessionCanceled,
-  sessionIntroduction,
-  sessionSurrendered,
-  sessionCompleted,
-  bumpMentorRequest,
-  skillsHelp,
-  skillsSet,
-  stats
-};
diff --git a/src/actions/timed.js b/src/actions/timed.ts
similarity index 67%
rename from src/actions/timed.js
rename to src/actions/timed.ts
index 056733b..a7e4340 100644
--- a/src/actions/timed.js
+++ b/src/actions/timed.ts
@@ -1,16 +1,15 @@
-const db = require("../db");
+import * as db from "db";
+import { runnable, interval } from "date";
 
-const { rescan } = require("./users");
-const message = require("./message");
-
-const { runnable, interval } = require("../date");
+import { rescan } from "./users";
+import * as message from "./message";
 
 const bumpSessions = () => {
   const sessions = db.getSessionsToBump();
   sessions.map(message.bumpMentorRequest);
 };
 
-const stats = () => {
+export const stats = () => {
   if (!runnable()) return;
   const created = db.getCreated();
   const online = db.getOnline();
@@ -20,7 +19,7 @@ const stats = () => {
   });
 };
 
-const init = () => {
+export const init = () => {
   // bump dead requests every 30s
   interval(bumpSessions, 30000);
   bumpSessions();
@@ -32,8 +31,5 @@ const init = () => {
   // send stats every 3 hours
   interval(stats, 1000 * 60 * 60 * 3);
 };
-module.exports = {
-  init,
-  runnable,
-  stats
-};
+
+export { runnable };
diff --git a/src/actions/users.js b/src/actions/users.js
deleted file mode 100644
index 13e5127..0000000
--- a/src/actions/users.js
+++ /dev/null
@@ -1,99 +0,0 @@
-const { CHANNEL_ID } = require("../../config");
-
-const { web } = require("../clients");
-
-const { welcome } = require("./message");
-
-const db = require("../db");
-
-const { runnable } = require("../date");
-
-const tryWelcome = (member, session, mentorChannelIds, canWelcome) => {
-  if (!session.welcomed && (canWelcome || mentorChannelIds.has(member.id))) {
-    welcome(
-      db.updateSession(member.id, {
-        welcomed: true
-      })
-    );
-  }
-};
-
-// tries to add a member to our index
-const tryAdd = (member, mentorChannelIds, canWelcome) => {
-  const session = db.getSession(member.id);
-  if (!member.is_bot && session == null) {
-    web.im.open({ user: member.id }).then(({ channel }) => {
-      tryWelcome(
-        member,
-        db.updateSession(member.id, {
-          id: member.id,
-          channel: channel.id,
-          name: member.name,
-          welcomed: false
-        }),
-        mentorChannelIds,
-        canWelcome
-      );
-    });
-  } else if (session != null) {
-    tryWelcome(member, session, mentorChannelIds, canWelcome);
-  }
-};
-
-const updateMentors = (members, mentorChannelIds) => {
-  const existingMentors = db.getMentors();
-  const mentors = {};
-  for (const member of members) {
-    if (mentorChannelIds.has(member.id)) {
-      mentors[member.id] = existingMentors[member.id] || {
-        skills: {}
-      };
-    }
-  }
-  Promise.all(Object.keys(mentors).map(user => web.users.getPresence({ user })))
-    .then(
-      results => results.filter(({ presence }) => presence === "active").length
-    )
-    .then(db.setOnline);
-  db.setMentors(mentors);
-};
-
-const rescan = () => {
-  const getMembers = (channel, cursor = undefined) => {
-    return web.conversations
-      .members({ channel, cursor, limit: 500 })
-      .then(({ members, response_metadata: { next_cursor } }) => {
-        if (next_cursor === "") {
-          return members;
-        } else {
-          return getMentors(channel, next_cursor).then(nextMembers => {
-            return [...members, ...nextMembers];
-          });
-        }
-      });
-  };
-  const getAll = (cursor = undefined) => {
-    return web.users
-      .list({ cursor, limit: 500 })
-      .then(({ members, response_metadata: { next_cursor } }) => {
-        const filtered_members = members.filter(m => !m.deleted);
-        if (next_cursor === "") {
-          return filtered_members;
-        } else {
-          return getAll(next_cursor).then(nextMembers => {
-            return [...filtered_members, ...nextMembers];
-          });
-        }
-      });
-  };
-  Promise.all([getAll(), getMembers(CHANNEL_ID)]).then(
-    ([members, _mentorChannelIds]) => {
-      const mentorChannelIds = new Set(_mentorChannelIds);
-      updateMentors(members, mentorChannelIds);
-      const canWelcome = runnable();
-      members.forEach(member => tryAdd(member, mentorChannelIds, canWelcome));
-    }
-  );
-};
-
-module.exports = { rescan, tryAdd };
diff --git a/src/actions/users.ts b/src/actions/users.ts
new file mode 100644
index 0000000..7fa7394
--- /dev/null
+++ b/src/actions/users.ts
@@ -0,0 +1,125 @@
+import config from "config";
+
+import { webClient } from "clients";
+import * as db from "db";
+
+import { runnable } from "date";
+import { welcome } from "actions/message";
+
+import { Session, UserID, ChannelID } from "typings";
+
+interface Member {
+  deleted: boolean;
+  id: UserID;
+  is_bot: boolean;
+  name: string;
+}
+
+const tryWelcome = (
+  member: Member,
+  session: Session,
+  mentorChannelIds: Set<UserID>,
+  canWelcome: boolean
+) => {
+  if (!session.welcomed && (canWelcome || mentorChannelIds.has(member.id))) {
+    welcome(
+      db.updateSession(member.id, {
+        welcomed: true
+      })
+    );
+  }
+};
+
+// tries to add a member to our index
+export const tryAdd = (
+  member: Member,
+  mentorChannelIds: Set<UserID>,
+  canWelcome: boolean
+) => {
+  const session = db.getSession(member.id);
+  if (!member.is_bot && session == null) {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    webClient.im.open({ user: member.id }).then(({ channel }: any) => {
+      tryWelcome(
+        member,
+        db.updateSession(member.id, {
+          id: member.id,
+          channel: channel.id,
+          name: member.name,
+          welcomed: false
+        }),
+        mentorChannelIds,
+        canWelcome
+      );
+    });
+  } else if (session != null) {
+    tryWelcome(member, session, mentorChannelIds, canWelcome);
+  }
+};
+
+const updateMentors = (members: Member[], mentorChannelIds: Set<UserID>) => {
+  const existingMentors = db.getMentors();
+  const mentors = {};
+  for (const member of members) {
+    if (mentorChannelIds.has(member.id)) {
+      mentors[member.id] = existingMentors[member.id] || {
+        skills: {}
+      };
+    }
+  }
+  Promise.all(
+    Object.keys(mentors).map(user => webClient.users.getPresence({ user }))
+  )
+    .then(
+      results => results.filter(({ presence }) => presence === "active").length
+    )
+    .then(db.setOnline);
+  db.setMentors(mentors);
+};
+
+export const rescan = () => {
+  const getMembers = (
+    channel: ChannelID,
+    cursor: string | undefined = undefined
+  ): Promise<UserID[]> => {
+    return webClient.conversations
+      .members({ channel, cursor, limit: 500 })
+      .then(({ members, response_metadata }) => {
+        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+        const { next_cursor } = response_metadata!;
+        if (next_cursor === "") {
+          return members as UserID[];
+        } else {
+          return getMembers(channel, next_cursor).then(nextMembers => {
+            return [...(members as UserID[]), ...nextMembers];
+          });
+        }
+      });
+  };
+  const getAll = (
+    cursor: string | undefined = undefined
+  ): Promise<Member[]> => {
+    return webClient.users
+      .list({ cursor, limit: 500 })
+      .then(({ members, response_metadata }) => {
+        // eslint-disable-next-line @typescript-eslint/no-non-null-assertion
+        const { next_cursor } = response_metadata!;
+        const filtered_members = (members as Member[]).filter(m => !m.deleted);
+        if (next_cursor === "") {
+          return filtered_members;
+        } else {
+          return getAll(next_cursor).then(nextMembers => {
+            return [...filtered_members, ...nextMembers];
+          });
+        }
+      });
+  };
+  Promise.all([getAll(), getMembers(config.CHANNEL_ID)]).then(
+    ([members, _mentorChannelIds]) => {
+      const mentorChannelIds = new Set(_mentorChannelIds);
+      updateMentors(members, mentorChannelIds);
+      const canWelcome = runnable();
+      members.forEach(member => tryAdd(member, mentorChannelIds, canWelcome));
+    }
+  );
+};
diff --git a/src/clients.js b/src/clients.js
deleted file mode 100644
index f23c07e..0000000
--- a/src/clients.js
+++ /dev/null
@@ -1,11 +0,0 @@
-const { WebClient } = require("@slack/web-api");
-const { createEventAdapter } = require("@slack/events-api");
-const { createMessageAdapter } = require("@slack/interactive-messages");
-
-const { SIGNING_SECRET, BOT_ACCESS_TOKEN } = require("../config");
-
-const events = createEventAdapter(SIGNING_SECRET);
-const interactions = createMessageAdapter(SIGNING_SECRET);
-const web = new WebClient(BOT_ACCESS_TOKEN);
-
-module.exports = { events, web, interactions };
diff --git a/src/clients.ts b/src/clients.ts
new file mode 100644
index 0000000..d5fad7a
--- /dev/null
+++ b/src/clients.ts
@@ -0,0 +1,9 @@
+import { WebClient } from "@slack/web-api";
+import { createEventAdapter } from "@slack/events-api";
+import { createMessageAdapter } from "@slack/interactive-messages";
+
+import config from "config";
+
+export const eventsClient = createEventAdapter(config.SIGNING_SECRET);
+export const interactionsClient = createMessageAdapter(config.SIGNING_SECRET);
+export const webClient = new WebClient(config.BOT_ACCESS_TOKEN);
diff --git a/src/actions/channel.js b/src/config/.gitkeep
similarity index 100%
rename from src/actions/channel.js
rename to src/config/.gitkeep
diff --git a/src/date.js b/src/date.js
deleted file mode 100644
index 3de1708..0000000
--- a/src/date.js
+++ /dev/null
@@ -1,17 +0,0 @@
-const start = new Date("2019-09-13T21:00:00-0400");
-const end = new Date("2019-09-15T12:00:00-0400");
-
-const runnable = () => {
-  const date = new Date();
-  const output = start <= date && date <= end;
-  if (!output) {
-    console.log(`${start} <= ${date} && ${date} <= ${end} is false, not running`);
-  }
-  return output;
-};
-
-const interval = (fn, ms) => setInterval(() => {
-  if (new Date() <= end) fn();
-}, ms);
-
-module.exports = {runnable, interval};
\ No newline at end of file
diff --git a/src/date.ts b/src/date.ts
new file mode 100644
index 0000000..5b2204f
--- /dev/null
+++ b/src/date.ts
@@ -0,0 +1,18 @@
+const start = new Date("2019-09-13T21:00:00-0400");
+const end = new Date("2019-09-15T12:00:00-0400");
+
+export const runnable = () => {
+  const date = new Date();
+  const output = start <= date && date <= end;
+  if (!output) {
+    console.log(
+      `${start} <= ${date} && ${date} <= ${end} is false, not running`
+    );
+  }
+  return output;
+};
+
+export const interval = (fn: () => void, ms: number) =>
+  setInterval(() => {
+    if (new Date() <= end) fn();
+  }, ms);
diff --git a/src/db.js b/src/db.js
deleted file mode 100644
index 917a735..0000000
--- a/src/db.js
+++ /dev/null
@@ -1,107 +0,0 @@
-const low = require("lowdb");
-const FileSync = require("lowdb/adapters/FileSync");
-
-const adapter = new FileSync("storage/db.json");
-const db = low(adapter);
-
-if (db.get("sessions").value() == null) {
-  db.set("sessions", {}).write();
-}
-
-const getSession = user =>
-  db
-    .get("sessions")
-    .get(user)
-    .value();
-
-const getSessionsToBump = () => {
-  const sessions = db.get("sessions").filter(session => 
-      session.submission != null && 
-      session.mentor == null && 
-      new Date(session.last_updated).getTime() < new Date().getTime() - (1000 * 60 * 10)
-  ).value();
-  for (const session of sessions) {
-    db.get("sessions").get(session.id).set("last_updated", new Date().toString()).write();
-  }
-  return sessions;
-}
-
-const updateSession = (user, newSession) => {
-  const session = {...(getSession(user) || {}), ...newSession, id: user, last_updated: new Date().toString()};
-  return db.get("sessions").set(user, session).write()[user];
-}
-
-const clearSession = user =>
-  db
-    .get("sessions")
-    .get(user)
-    .set("ts", undefined)
-    .set("mentor", undefined)
-    .set("mentor_claim_ts", undefined)
-    .set("group_id", undefined)
-    .write();
-
-const getUserIdByThreadTs = threadTs =>
-  db
-    .get("sessions")
-    .findKey(channel => channel.ts === threadTs)
-    .value();
-
-const getMentors = () =>
-  db
-    .get("mentors")
-    .value() || {};
-
-const setMentors = (mentors) =>
-  db 
-    .set("mentors", mentors)
-    .write();
-
-const getMentor = (user) =>
-  db
-    .get("mentors")
-    .get(user)
-    .value();
-  
-const setMentorSkills = (user, skills) =>
-  db
-    .get("mentors")
-    .get(user)
-    .set("skills", skills)
-    .write();
-
-const getOnline = () => 
-  db
-    .get("online")
-    .value() || 0;
-
-const setOnline = (count) =>
-  db
-    .set("online", count)
-    .write();
-    
-const getCreated = () => 
-db
-  .get("created")
-  .value() || 0;
-
-const bumpCreated = () =>
-db
-  .set("created", getCreated() + 1)
-  .write();
-
-module.exports = {
-  getSession,
-  getSessionsToBump,
-  clearSession,
-  getUserIdByThreadTs,
-  updateSession,
-  getMentors,
-  setMentors,
-  getMentor,
-  setMentorSkills,
-  getOnline,
-  setOnline,
-  getCreated,
-  bumpCreated,
-};
diff --git a/src/db.ts b/src/db.ts
new file mode 100644
index 0000000..c81354a
--- /dev/null
+++ b/src/db.ts
@@ -0,0 +1,114 @@
+/* eslint-disable @typescript-eslint/ban-ts-ignore */
+import low from "lowdb";
+import FileSync from "lowdb/adapters/FileSync";
+import {
+  Session,
+  UserID,
+  TS,
+  Mentor,
+  Skills,
+  isActive,
+  isClaimed,
+  ActiveSession
+} from "typings";
+
+const adapter = new FileSync("storage/db.json");
+const db = low(adapter);
+
+if (db.get("sessions").value() == null) {
+  db.set("sessions", {}).write();
+}
+
+export const getSession = (user: UserID): Session =>
+  db
+    .get("sessions")
+    // @ts-ignore
+    .get(user)
+    .value();
+
+export const getSessionsToBump = () => {
+  const sessions = db
+    .get("sessions")
+    // @ts-ignore
+    .filter(
+      (session: Session) =>
+        isActive(session) &&
+        !isClaimed(session) &&
+        new Date(session.last_updated).getTime() <
+          new Date().getTime() - 1000 * 60 * 10
+    )
+    .value();
+  for (const session of sessions) {
+    db.get("sessions")
+      // @ts-ignore
+      .get(session.id)
+      .set("last_updated", new Date().toString())
+      .write();
+  }
+  return sessions;
+};
+
+export const updateSession = (
+  user: UserID,
+  newSession: Partial<Session>
+): Session => {
+  const session = {
+    ...(getSession(user) || {}),
+    ...newSession,
+    id: user,
+    // eslint-disable-next-line @typescript-eslint/camelcase
+    last_updated: new Date().toString()
+  };
+  return (
+    db
+      .get("sessions")
+      .set(user, session)
+      // @ts-ignore
+      .write()[user]
+  );
+};
+
+export const clearSession = (user: UserID) =>
+  db
+    .get("sessions")
+    // @ts-ignore
+    .get(user)
+    .set("ts", undefined)
+    .set("mentor", undefined)
+    .set("mentor_claim_ts", undefined)
+    .set("group_id", undefined)
+    .write();
+
+export const getUserIdByThreadTs = (threadTs: TS): UserID | undefined =>
+  db
+    .get("sessions")
+    .findKey((session: ActiveSession) => session.ts === threadTs)
+    .value();
+
+export const getMentors = () => db.get("mentors").value() || {};
+
+export const setMentors = (mentors: { [key: string]: Mentor }) =>
+  db.set("mentors", mentors).write();
+
+export const getMentor = (user: UserID) =>
+  db
+    .get("mentors")
+    // @ts-ignore
+    .get(user)
+    .value();
+
+export const setMentorSkills = (user: UserID, skills: Skills) =>
+  db
+    .get("mentors")
+    // @ts-ignore
+    .get(user)
+    .set("skills", skills)
+    .write();
+
+export const getOnline = () => db.get("online").value() || 0;
+
+export const setOnline = (count: number) => db.set("online", count).write();
+
+export const getCreated = () => db.get("created").value() || 0;
+
+export const bumpCreated = () => db.set("created", getCreated() + 1).write();
diff --git a/src/events/interactions.js b/src/events/interactions.js
deleted file mode 100644
index c1f8bcf..0000000
--- a/src/events/interactions.js
+++ /dev/null
@@ -1,115 +0,0 @@
-const Text = require("../text");
-
-const message = require("../actions/message");
-
-const { web } = require("../clients");
-
-const {
-  bumpCreated,
-  getSession,
-  clearSession,
-  getUserIdByThreadTs,
-  updateSession
-} = require("../db");
-
-const handleNeedMentor = (payload, respond) => {
-  // check for existing session
-  const session = getSession(payload.user.id);
-  if (session.ts != null) {
-    respond({
-      text: Text.SESSION_ALREADY_ACTIVE
-    });
-  } else {
-    // send problem prompt text
-    message.openMentorRequestDialog(payload.trigger_id, payload.message.ts);
-  }
-};
-
-const handleMentorRequest = payload => {
-  const { user, channel, submission, state } = payload;
-  const session = updateSession(user.id, {
-    username: user.name,
-    channel: channel.id,
-    mentee_ts: state,
-    submission
-  });
-  message
-    .postMentorRequest(session)
-    .then(({ ts }) =>
-      message.confirmMentorRequest(updateSession(user.id, { ts }))
-    );
-  bumpCreated();
-};
-
-const handleCancelRequest = ({ user: { id } }, respond) => {
-  const session = getSession(id);
-  message.postSessionCanceled(session);
-  clearSession(id);
-  message.needMentor(session);
-
-  // respond in private mentor channel
-};
-
-const handleClaimRequest = payload => {
-  const userId = getUserIdByThreadTs(payload.message.ts);
-  const session = updateSession(userId, { mentor: payload.user.id });
-
-  web.conversations
-    .open({
-      users: [session.id, session.mentor].join(",")
-    })
-    .then(response => {
-      const groupId = response.channel.id;
-      message
-        .sessionIntroduction(updateSession(session.id, { group_id: groupId }))
-        .then(({ ts, channel }) =>
-          updateSession(userId, {
-            mentor_claim_ts: ts,
-            mentor_channel: channel
-          })
-        );
-    });
-};
-
-const handleDeleteRequest = payload => {
-  const userId = payload.actions[0].value;
-  const session = getSession(userId);
-  message.postSessionDeleted(session);
-  clearSession(userId);
-};
-
-const handleSurrenderRequest = payload => {
-  const userId = payload.actions[0].value;
-  const session = getSession(userId);
-  message.sessionSurrendered(
-    session,
-    updateSession(userId, {
-      mentor_claim_ts: undefined,
-      group_id: undefined,
-      mentor: undefined
-    })
-  );
-};
-
-const handleCompleteRequest = payload => {
-  const userId = payload.actions[0].value;
-  const session = getSession(userId);
-  message.sessionCompleted(session).then(() => {
-    clearSession(userId);
-  });
-};
-
-const bootstrap = interactions => {
-  interactions.action({ actionId: "need_mentor" }, handleNeedMentor);
-  interactions.action({ callbackId: "mentor_request" }, handleMentorRequest);
-  interactions.action({ actionId: "cancel_request" }, handleCancelRequest);
-  interactions.action({ actionId: "claim_request" }, handleClaimRequest);
-  interactions.action({ actionId: "delete_request" }, handleDeleteRequest);
-  interactions.action(
-    { actionId: "surrender_request" },
-    handleSurrenderRequest
-  );
-  interactions.action({ actionId: "complete_request" }, handleCompleteRequest);
-};
-
-module.exports = { bootstrap };
diff --git a/src/events/interactions.ts b/src/events/interactions.ts
new file mode 100644
index 0000000..5bea1a3
--- /dev/null
+++ b/src/events/interactions.ts
@@ -0,0 +1,161 @@
+import SlackMessageAdapter from "@slack/interactive-messages/dist/adapter";
+
+import Text from "text";
+import * as message from "actions/message";
+import { webClient } from "clients";
+
+import {
+  bumpCreated,
+  getSession,
+  clearSession,
+  getUserIdByThreadTs,
+  updateSession
+} from "db";
+
+import {
+  UserID,
+  ChannelID,
+  Submission,
+  TS,
+  coerceActive,
+  coerceClaimed,
+  ActiveSession,
+  ClaimedSession,
+  isActive
+} from "typings";
+
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+type Respond = (message: any) => Promise<unknown>;
+interface ActionPayload {
+  channel: {
+    id: ChannelID;
+  };
+  trigger_id: string;
+  user: {
+    name: string;
+    id: UserID;
+  };
+}
+interface MessagePayload extends ActionPayload {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  actions: any;
+  message: {
+    ts: string;
+  };
+}
+interface DialogPayload extends ActionPayload {
+  state: string;
+  submission: Submission;
+}
+
+const handleNeedMentor = (payload: MessagePayload, respond: Respond) => {
+  // check for existing session
+  const session = getSession(payload.user.id);
+  if (isActive(session)) {
+    respond({
+      text: Text.SESSION_ALREADY_ACTIVE
+    });
+  } else {
+    // send problem prompt text
+    message.openMentorRequestDialog(payload.trigger_id, payload.message.ts);
+  }
+};
+
+const handleMentorRequest = (payload: DialogPayload) => {
+  const { user, channel, submission, state } = payload;
+  const session = updateSession(user.id, {
+    username: user.name,
+    channel: channel.id,
+    mentee_ts: state,
+    submission
+  });
+  message
+    .postMentorRequest(session as ActiveSession)
+    .then(({ ts }) =>
+      message.confirmMentorRequest(
+        coerceActive(updateSession(user.id, { ts: ts as TS }))
+      )
+    );
+  bumpCreated();
+};
+
+const handleCancelRequest = ({ user: { id } }: MessagePayload) => {
+  const session = coerceActive(getSession(id), true);
+  message.postSessionCanceled(session);
+  clearSession(id);
+  message.needMentor(session);
+};
+
+const handleClaimRequest = (payload: MessagePayload) => {
+  const userId = getUserIdByThreadTs(payload.message.ts);
+
+  if (userId === undefined)
+    throw new Error(`Undefined user_id for ts '${payload.message.ts}'`);
+
+  const session = updateSession(userId, {
+    mentor: payload.user.id
+  }) as ClaimedSession;
+
+  webClient.conversations
+    .open({
+      users: [session.id, session.mentor].join(",")
+    })
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    .then(({ channel: { id } }: any) => {
+      message
+        .sessionIntroduction(updateSession(session.id, {
+          group_id: id
+        }) as ClaimedSession)
+        .then(({ ts, channel }) =>
+          coerceClaimed(
+            updateSession(userId, {
+              mentor_claim_ts: ts as TS,
+              mentor_channel: channel as ChannelID
+            })
+          )
+        );
+    });
+};
+
+const handleDeleteRequest = (payload: MessagePayload) => {
+  const userId = payload.actions[0].value;
+  const session = coerceActive(getSession(userId), true);
+  message.postSessionDeleted(session);
+  clearSession(userId);
+};
+
+const handleSurrenderRequest = (payload: MessagePayload) => {
+  const userId = payload.actions[0].value;
+  const session = coerceClaimed(getSession(userId));
+  message.sessionSurrendered(
+    session,
+    coerceActive(
+      updateSession(userId, {
+        mentor_claim_ts: undefined,
+        group_id: undefined,
+        mentor: undefined
+      })
+    )
+  );
+};
+
+const handleCompleteRequest = (payload: MessagePayload) => {
+  const userId = payload.actions[0].value;
+  const session = coerceClaimed(getSession(userId));
+  message.sessionCompleted(session).then(() => {
+    clearSession(userId);
+  });
+};
+
+export const bootstrap = (interactions: SlackMessageAdapter) => {
+  interactions.action({ actionId: "need_mentor" }, handleNeedMentor);
+  interactions.action({ callbackId: "mentor_request" }, handleMentorRequest);
+  interactions.action({ actionId: "cancel_request" }, handleCancelRequest);
+  interactions.action({ actionId: "claim_request" }, handleClaimRequest);
+  interactions.action({ actionId: "delete_request" }, handleDeleteRequest);
+  interactions.action(
+    { actionId: "surrender_request" },
+    handleSurrenderRequest
+  );
+  interactions.action({ actionId: "complete_request" }, handleCompleteRequest);
+};
diff --git a/src/events/message.js b/src/events/message.ts
similarity index 86%
rename from src/events/message.js
rename to src/events/message.ts
index f8d9016..31ab47a 100644
--- a/src/events/message.js
+++ b/src/events/message.ts
@@ -1,8 +1,8 @@
-const { SKILLS } = require("../../config");
+import config from "config";
 
-const db = require("../db");
-const message = require("../actions/message");
-const timed = require("../actions/timed");
+import db from "db";
+import message from "actions/message";
+import timed from "../actions/timed";
 
 const messageHandler = event => {
   // ignore bot messages
@@ -29,7 +29,7 @@ const messageHandler = event => {
         } else {
           const skillsObj = {};
           for (const part of parts) {
-            if (part in SKILLS) {
+            if (part in config.SKILLS) {
               skillsObj[part] = true;
             }
           }
@@ -57,4 +57,4 @@ const messageHandler = event => {
   }
 };
 
-module.exports = messageHandler;
+export const handle = messageHandler;
diff --git a/src/server.js b/src/server.js
deleted file mode 100644
index 363cd5d..0000000
--- a/src/server.js
+++ /dev/null
@@ -1,60 +0,0 @@
-const http = require("http");
-const bodyParser = require("body-parser");
-const express = require("express");
-const request = require('request');
-
-const port = process.env.PORT || 3000;
-
-const { events, interactions } = require("./clients");
-
-const { SLACK_CLIENT_ID, SLACK_CLIENT_SECRET } = require("../config");
-
-const app = express();
-
-app.get('/auth', function(req, res){
-  if (!req.query.code) { // access denied
-    return;
-  }
-  var data = {form: {
-    client_id: SLACK_CLIENT_ID,
-    client_secret: SLACK_CLIENT_SECRET,
-    code: req.query.code
-  }};
-  request.post('https://slack.com/api/oauth.access', data, function (error, response, body) {
-    if (!error && response.statusCode == 200) {
-      // Get an auth token
-      let oauthToken = JSON.parse(body).access_token;
-
-      console.log(body);
-      // OAuth done- redirect the user to wherever
-      res.redirect(__dirname + "/public/success.html");
-    }
-  })
-});
-
-// Plug the event adapter into the express app as middleware
-app.use("/slack/events", events.expressMiddleware());
-
-// Plug the interactions adapter into the express app as middleware
-require("./events/interactions").bootstrap(interactions);
-app.use("/slack/actions", interactions.expressMiddleware());
-
-app.use(bodyParser.json());
-app.use(bodyParser.urlencoded({ extended: true }));
-
-// Attach listeners to events by Slack Event "type". See: https://api.slack.com/events/message.im
-events.on("message", event => require("./events/message")(event));
-// events.on('app_mention', require('./events/message'));
-// events.on('message.im', require('./events/message'));
-// events.on('message.group', console.log);
-
-// Handle errors (see `errorCodes` export)
-events.on("error", console.error);
-
-// Start a basic HTTP server
-http.createServer(app).listen(port, () => {
-  // Listening on path '/slack/events' by default
-  console.log(`Server listening on port ${port}`);
-});
-
-require("./actions/timed").init();
\ No newline at end of file
diff --git a/src/server.ts b/src/server.ts
new file mode 100644
index 0000000..9767b93
--- /dev/null
+++ b/src/server.ts
@@ -0,0 +1,69 @@
+import http from "http";
+import bodyParser from "body-parser";
+import express from "express";
+import request from "request";
+
+const port = process.env.PORT || 3000;
+
+import { eventsClient, interactionsClient } from "clients";
+
+import interactions from "events/interactions";
+import message from "events/message";
+
+import config from "config";
+
+const app = express();
+
+app.get("/auth", function(req, res) {
+  if (!req.query.code) {
+    // access denied
+    return;
+  }
+  const data = {
+    form: {
+      client_id: config.SLACK_CLIENT_ID,
+      client_secret: config.SLACK_CLIENT_SECRET,
+      code: req.query.code
+    }
+  };
+  request.post("https://slack.com/api/oauth.access", data, function(
+    error,
+    response,
+    body
+  ) {
+    if (!error && response.statusCode == 200) {
+      // Get an auth token
+      res.json({
+        success: true,
+        result: body
+      });
+    } else {
+      res.json({
+        success: false,
+        error
+      });
+    }
+  });
+});
+
+// Plug the event adapter into the express app as middleware
+app.use("/slack/events", eventsClient.expressMiddleware());
+
+// Plug the interactions adapter into the express app as middleware
+interactions.bootstrap(interactionsClient);
+app.use("/slack/actions", interactionsClient.expressMiddleware());
+
+app.use(bodyParser.json());
+app.use(bodyParser.urlencoded({ extended: true }));
+
+eventsClient.on("message", event => message.handle(event));
+eventsClient.on("error", console.error);
+
+// Start a basic HTTP server
+http.createServer(app).listen(port, () => {
+  // Listening on path '/slack/events' by default
+  console.log(`Server listening on port ${port}`);
+});
+
+import timed from "actions/timed";
+timed.init();
diff --git a/src/text.js b/src/text.js
deleted file mode 100644
index 18e029e..0000000
--- a/src/text.js
+++ /dev/null
@@ -1,69 +0,0 @@
-const { SKILLS } = require("../config");
-
-const db = require("./db");
-
-module.exports = {
-  WELCOME: name =>
-    `Hi ${name ? name : "hacker"}, welcome to Hack the North 2019! :wave:
-
-I’m Mentorship Bot, here to help you
-find a mentor at any time during the
-event.`,
-  BUMP: (permalink, session) => `<@${session.id}>'s <${permalink}|mentorship request${session.submission.skill != null ? ` regarding ${session.submission.skill}` : ''}> has not received any attention recently. Please take a look!`,
-  BUMP_SURRENDER: (permalink, session) => `<@${session.id}>'s <${permalink}|mentorship request${session.submission.skill != null ? ` regarding ${session.submission.skill}` : ''}> *was surrendered*. Someone please take a look!`,
-  NEED_MENTOR: "Need a mentor? Simply click the button below.",
-  NEED_MENTOR_BUTTON: "I need a mentor",
-  NO_SESSION: "You do not currently have a mentorship session active.",
-  NO_UNDERSTAND: "Sorry, I am not equipped to deal with messages.",
-  NO_UNDERSTAND_MENTOR: "Sorry, I don't understand your message. Try `!skills help` to see and set your skills",
-  REQUEST_CONFIRM: "*Your request has been sent to mentors*",
-  CANCEL_REQUEST_BUTTON: "Cancel Request",
-  MENTOR_REQUEST_CLAIMED: claimer => `Request claimed by <@${claimer}>`,
-  MENTOR_REQUEST_CANCELED: "*Request canceled by user*",
-  MENTOR_REQUEST_DELETED: "*Request has been deleted*",
-  MENTOR_REQUEST_TITLE: (user, { location, skill }, mentors) =>
-    `Mentorship request from @${user}\nLocation: ${location}${skill != null ? `\nCategory: ${SKILLS[skill]} ${mentors.length > 0 ? `(${mentors.map(m => `<@${m}>`).join(', ')})` : ''}` : ''}`,
-  MENTOR_REQUEST_DETAILS: ({ description }) => description,
-  MENTOR_REQUEST_CONFIRM: "Claim",
-  MENTOR_REQUEST_DELETE: "Delete",
-  MENTOR_REQUEST_SURRENDER: "Surrender",
-  MENTOR_REQUEST_COMPLETE: 'Mark Complete',
-  MENTEE_MESSAGE_NOTIF: username =>
-    `Your request has been submitted @${username}!`,
-  SESSION_ALREADY_ACTIVE: "You already have an active mentorship session",
-  SESSION_CLAIMED: ({id}) =>
-    `Thank you for claiming <@${id}>'s request ️❤️. Please use this message to manage this session.`,
-  SESSION_DELETED:
-    "Your mentorship request was deleted by a mentor - if you believe this was a mistake, please make a new request or contact our mentorship lead @bonnie",
-  SESSION_DELETED_MENTOR: "This mentorship request has been deleted",
-  SESSION_INTRODUCTION: (session) => `👋 Hello <@${session.id}>! Your session has been claimed by <@${session.mentor}>, our resident expert of Hacking, Northing, and everything in-between. As a reminder, your request was as follows:`,
-  SESSION_SURRENDERED_MENTOR: `You have surrendered the session`,
-  SESSION_SURRENDERED: (session) => `<@${session.mentor}> has surrendered - your request will be placed back in the pool of active mentor requests`,
-  SESSION_COMPLETED_MENTOR: `Your session has has been marked complete`,
-  SESSION_COMPLETED_MENTEE: `*Your request has been marked complete*`,
-  SESSION_COMPLETED: (session) => `<@${session.mentor}> has marked this session as completed. Archiving this channel 😎`,
-  SKILLS_HELP: (skills) => 
-    `Set your skills so we can notify you when a relevant request comes in! 
-
-You can set your skills with the command 
-\`\`\`
-!skills [skill1] [skill2] ...
-\`\`\`
-
-*The available skills are:*
-
-${skills.join("\n")}`,
-  SKILLS_SET: (skills) => `You have successfully set your skills to 
-\`\`\`
-${skills.length > 0 ? `[\n  ${skills.join(",\n  ")}\n]` : `[None]`}
-\`\`\` 
-`,
-  STATS: (stats) => `Hello there! Your friendly neighbourhood mentorship bot reporting in 😊
-
-So far, we have:
-👋 ${stats.created} mentor requests created
-😊 ${stats.online} mentor${stats.online === 1 ? '' : 's'} online
-
-Need a mentor? Send me a message and we'll get you help ASAP. Alternatively, feel free to drop by the mentorship hub in the E7 CND (check the map)! 
-`
-};
diff --git a/src/text.ts b/src/text.ts
new file mode 100644
index 0000000..3cb71a1
--- /dev/null
+++ b/src/text.ts
@@ -0,0 +1,104 @@
+import config from "config";
+import {
+  UserID,
+  Submission,
+  UserName,
+  ActiveSession,
+  ClaimedSession,
+  Skills
+} from "./typings";
+
+export default {
+  WELCOME: (name?: string) =>
+    `Hi ${name ? name : "hacker"}, welcome to Hack the North 2019! :wave:
+
+I’m Mentorship Bot, here to help you
+find a mentor at any time during the
+event.`,
+  BUMP: (permalink: string, session: ActiveSession) =>
+    `<@${session.id}>'s <${permalink}|mentorship request${
+      session.submission.skill != null
+        ? ` regarding ${session.submission.skill}`
+        : ""
+    }> has not received any attention recently. Please take a look!`,
+  BUMP_SURRENDER: (permalink: string, session: ActiveSession) =>
+    `<@${session.id}>'s <${permalink}|mentorship request${
+      session.submission.skill != null
+        ? ` regarding ${session.submission.skill}`
+        : ""
+    }> *was surrendered*. Someone please take a look!`,
+  NEED_MENTOR: "Need a mentor? Simply click the button below.",
+  NEED_MENTOR_BUTTON: "I need a mentor",
+  NO_SESSION: "You do not currently have a mentorship session active.",
+  NO_UNDERSTAND: "Sorry, I am not equipped to deal with messages.",
+  NO_UNDERSTAND_MENTOR:
+    "Sorry, I don't understand your message. Try `!skills help` to see and set your skills",
+  REQUEST_CONFIRM: "*Your request has been sent to mentors*",
+  CANCEL_REQUEST_BUTTON: "Cancel Request",
+  MENTOR_REQUEST_CLAIMED: (claimer: UserID) =>
+    `Request claimed by <@${claimer}>`,
+  MENTOR_REQUEST_CANCELED: "*Request canceled by user*",
+  MENTOR_REQUEST_DELETED: "*Request has been deleted*",
+  MENTOR_REQUEST_TITLE: (
+    user: string,
+    { location, skill }: Submission,
+    mentors: UserID[]
+  ) =>
+    `Mentorship request from @${user}\nLocation: ${location}${
+      skill != null
+        ? `\nCategory: ${config.SKILLS[skill]} ${
+            mentors.length > 0
+              ? `(${mentors.map(m => `<@${m}>`).join(", ")})`
+              : ""
+          }`
+        : ""
+    }`,
+  MENTOR_REQUEST_DETAILS: ({ description }: Submission) => description,
+  MENTOR_REQUEST_CONFIRM: "Claim",
+  MENTOR_REQUEST_DELETE: "Delete",
+  MENTOR_REQUEST_SURRENDER: "Surrender",
+  MENTOR_REQUEST_COMPLETE: "Mark Complete",
+  MENTEE_MESSAGE_NOTIF: (username: UserName) =>
+    `Your request has been submitted @${username}!`,
+  SESSION_ALREADY_ACTIVE: "You already have an active mentorship session",
+  SESSION_CLAIMED: ({ id }: ActiveSession) =>
+    `Thank you for claiming <@${id}>'s request ️❤️. Please use this message to manage this session.`,
+  SESSION_DELETED:
+    "Your mentorship request was deleted by a mentor - if you believe this was a mistake, please make a new request or contact our mentorship lead @bonnie",
+  SESSION_DELETED_MENTOR: "This mentorship request has been deleted",
+  SESSION_INTRODUCTION: (session: ClaimedSession) =>
+    `👋 Hello <@${session.id}>! Your session has been claimed by <@${session.mentor}>, our resident expert of Hacking, Northing, and everything in-between. As a reminder, your request was as follows:`,
+  SESSION_SURRENDERED_MENTOR: `You have surrendered the session`,
+  SESSION_SURRENDERED: (session: ClaimedSession) =>
+    `<@${session.mentor}> has surrendered - your request will be placed back in the pool of active mentor requests`,
+  SESSION_COMPLETED_MENTOR: `Your session has has been marked complete`,
+  SESSION_COMPLETED_MENTEE: `*Your request has been marked complete*`,
+  SESSION_COMPLETED: (session: ClaimedSession) =>
+    `<@${session.mentor}> has marked this session as completed. Archiving this channel 😎`,
+  SKILLS_HELP: (skills: Skills) =>
+    `Set your skills so we can notify you when a relevant request comes in!
+
+You can set your skills with the command
+\`\`\`
+!skills [skill1] [skill2] ...
+\`\`\`
+
+*The available skills are:*
+
+${skills.join("\n")}`,
+  SKILLS_SET: (skills: Skills) => `You have successfully set your skills to
+\`\`\`
+${skills.length > 0 ? `[\n  ${skills.join(",\n  ")}\n]` : `[None]`}
+\`\`\`
+`,
+  STATS: (stats: { created: number; online: number }) => {
+    return `Hello there! Your friendly neighbourhood mentorship bot reporting in 😊
+
+So far, we have:
+👋 ${stats.created} mentor requests created
+😊 ${stats.online} mentor${stats.online === 1 ? "" : "s"} online
+
+Need a mentor? Send me a message and we'll get you help ASAP. Alternatively, feel free to drop by the mentorship hub in the E7 CND (check the map)!
+`;
+  }
+};
diff --git a/src/typings.ts b/src/typings.ts
new file mode 100644
index 0000000..b603c78
--- /dev/null
+++ b/src/typings.ts
@@ -0,0 +1,80 @@
+export type Skill = string;
+export type Skills = Skill[];
+
+export type TS = string;
+
+export type UserID = string;
+export type UserName = string;
+
+export type ChannelID = string;
+
+export interface EmptySession {
+  id: UserID;
+  channel: ChannelID;
+  name: string;
+  last_updated: string;
+  welcomed: boolean;
+}
+
+export interface Submission {
+  location: string;
+  description: string;
+  skill: Skill;
+}
+export interface ActiveSession extends EmptySession {
+  username: UserName;
+  mentee_ts: TS;
+  ts: TS;
+  submission: Submission;
+}
+export interface ClaimedSession extends ActiveSession {
+  group_id: ChannelID;
+  mentor_claim_ts: TS;
+  mentor: UserID;
+  mentor_channel: ChannelID;
+}
+
+export type Session = EmptySession | ActiveSession | ClaimedSession;
+export function isActive(session: Session): session is ActiveSession {
+  // ts set last when transitioning empty -> active
+  return typeof (session as ActiveSession).ts === "string";
+}
+export function isClaimed(session: Session): session is ClaimedSession {
+  // mentor_claim_ts set last when transitioning active -> claimed
+  return typeof (session as ClaimedSession).mentor_claim_ts === "string";
+}
+export function isEmpty(session: Session): session is EmptySession {
+  return !isActive(session) && !isClaimed(session);
+}
+
+export class SessionCoerceError extends Error {
+  constructor(type: string) {
+    super(`Failed to coerce session object to type '${type}'`);
+    Object.setPrototypeOf(this, new.target.prototype);
+  }
+}
+export function coerceActive(
+  session: Session,
+  allowClaimed = false
+): ActiveSession {
+  if (isActive(session) && (allowClaimed || !isClaimed(session))) {
+    return session;
+  }
+  throw new SessionCoerceError("active");
+}
+export function coerceClaimed(session: Session): ClaimedSession {
+  if (isClaimed(session)) {
+    return session;
+  }
+  throw new SessionCoerceError("claimed");
+}
+export function coerceEmpty(session: Session): EmptySession {
+  if (isEmpty(session)) {
+    return session;
+  }
+  throw new SessionCoerceError("empty");
+}
+
+export interface Mentor {
+  skills: Skills;
+}
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..09e4234
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,27 @@
+{
+    "compilerOptions": {
+      "baseUrl": "src",
+      "outDir": "build/dist",
+      "module": "es2015",
+      "target": "es6",
+      "lib": ["es6"],
+      "sourceMap": true,
+      "moduleResolution": "node",
+      "resolveJsonModule": true,
+      "rootDir": "src",
+      "forceConsistentCasingInFileNames": true,
+      "noImplicitReturns": true,
+      "noImplicitThis": true,
+      "noImplicitAny": true,
+      "importHelpers": true,
+      "strictNullChecks": true,
+      "suppressImplicitAnyIndexErrors": true,
+      "skipLibCheck": true,
+      "allowSyntheticDefaultImports": true,
+      "strict": true,
+      "isolatedModules": true,
+      "noEmit": true,
+      "types": ["node"]
+    },
+    "include": ["src"]
+  }
\ No newline at end of file